Add support for netatmo cameras and other m3u8 stream cameras

[oweinsto68]

It would be nice and easy to add support to m3u8 stream cameras (netatmo use this format).
I successfully got my camera running by doing the folowing:

• use rtsp: unifi-cam-proxy --host protectIP --mac 'AA:BB:CC:00:11:22' --cert client.pem --token XXXX rtsp -s http://camIP/XXXX/live/files/high/index.m3u8
• modify cams/base.py and removing -rtsp_transport and stimeout options
  It was not a clean way to do it but it shows that it is possible and pretty easy

Regards
Olivier